Fluoroelastomer Centre
Long-term Retention of Sealing Force of ZruElast® FPM
Resistance to compression set is another very important physical property in sealing technology. The lower the compression set values, the better the sealing force and ability to recover from applied deformation. In combination with exposure to high temperatures, ZruElast FPM further shows its superior compression set properties. Without any problems values of 8% at 200° C can be achieved.
ZruElast FPM is also unbeatable when it comes to sealing force over a longer period. As illustrated in figure 5, all other common elastomers fail long before. After 100 hours of use in static application in air at 150° C ZruElast FPM retains 91% of its original sealing force, while silicone, acrylate and nitrile rubber with 69%, 56% and 38% show values well below. After 10,000 hours of service time at last only FPM provides sufficient sealing force (70%) These characteristics are of special importance when designing long-life, high-quality machines, where absolute product reliability is demanded, when high guarantees are required or when the risks of causing environmental damage due to seal failure or leakage become incalculable.
